OSX CPU throttling script

throttle.sh

#!/usr/local/bin/bash

function disable_throttling() {
	echo "Disabling CPU throttling"
	for pid in `pgrep cputhrottle`; do
		kill "$pid"
	done
}

if [[ "$UID" -ne 0 ]]; then
	echo "Running as super-user"
	sudo "$0" "$@"
	exit 0
fi

if [[ -z "$1" ]]; then
	echo "You should specify application names"
	echo ""
	echo "Usage $0 <app1> [ <app2> .. ] <cpu>"
	echo "<application> - string: name of any application (or 'disable' to stop CPU throttling for any application)"
	echo "<cpu>         - number: cpu percentage (0..400)"
	exit 0
fi

if [[ "$1" == "disable" ]]; then
	disable_throttling
	exit 0
fi

applicationsArrayLength=$(($#-1))
applicationsArray=${@:1:$applicationsArrayLength}
cpuUsage=${@: -1}

echo "Throttling CPU usage for [$applicationsArray] ($cpuUsage %)"

declare -A cputhrottle_id_map

while true
do
	for application in $applicationsArray; do
		for pid in `pgrep -x "$application"`; do
			if [ ! ${cputhrottle_id_map[$pid]+_} ]; then
				echo "Found new process for $application (PID: $pid)"
				cputhrottle "$pid" "$cpuUsage" &>/dev/null &
				cputhrottle_id_map[$pid]="$application:$!"
				echo "Throttling $application (PID: $pid) with cputhrottle (PID: $!)"
			fi
			# echo `ps -p 52848 -o comm=` | awk -F/ '{print $NF}'

		done	
	done

	echo "^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"
	for pid in "${!cputhrottle_id_map[@]}"; do
		pid_application_name=`ps -p $pid -o comm= | awk -F/ '{print $NF}'`
		pid_application_name_in_cputhrottle_map=`echo "${cputhrottle_id_map[$pid]}" | awk -F: '{print $1}'`
		pid_cputhrottle=`echo "${cputhrottle_id_map[$pid]}" | awk -F: '{print $2}'`
		pid_cputhrottle_name=`ps -p "$pid_cputhrottle" -o comm= | awk -F/ '{print $NF}'`

		if [ ! -n "$(ps -p $pid -o pid=)" ] || [ "$pid_application_name" != "$pid_application_name_in_cputhrottle_map" ]; then
			echo "Application $pid_application_name (PID: $pid) does not exist, clearing map from it"
			unset cputhrottle_id_map[$pid]

			if [ -n "$(ps -p $pid_cputhrottle -o pid=)" ] && [ "$pid_cputhrottle_name" == "cputhrottle" ]; then
				echo "Killing cputhrottle process (PID: $pid_cputhrottle)"
				kill "$pid_cputhrottle"
			fi	
		fi 

		echo "$pid_application_name ($pid) - $pid_application_name_in_cputhrottle_map ($pid_cputhrottle)"
	done
	echo "======================================================="

	sleep 5
done